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When your motion system demands repeatable accuracy, a loose-fitting or poorly machined pulley becomes the weakest link. Engineers, makers, and machine builders working with GT2 belt drives need a pulley that locks firmly to the shaft, meshes cleanly with the belt, and holds its position under continuous load. This GT2 6mm timing belt pulley in BF-type configuration is designed for exactly that — delivering consistent, low-backlash power transmission in compact drive systems.
Each pulley is machined from aluminum alloy and features a BF-type hub with a set-screw bore for secure shaft clamping. The tooth profile conforms to the GT2 standard (2mm pitch), and the pulley body is sized for 6mm-wide belts. Tooth counts range from 62T to 120T (approximately 39.5mm to 76.4mm pitch diameter), and bore diameters span 5mm to 25mm (approx. 0.197" to 0.984"), covering a wide range of motor and shaft sizes.
Typical applications include 3D printer extruder and axis drives, CNC router and laser cutter gantry systems, robotic arm joint actuators, and custom automation conveyor pulleys. Whether you are building a CoreXY 3D printer, a belt-driven linear actuator, or a multi-axis pick-and-place machine, this pulley integrates directly into standard GT2 belt drive assemblies.
| Belt Standard | GT2 (2mm pitch) |
|---|---|
| Applicable Belt Width | 6mm |
| Tooth Count Options | 62T, 64T, 65T, 66T, 68T, 70T, 72T, 74T, 75T, 76T, 78T, 80T, 90T, 100T, 110T, 120T |
| Bore Diameter Options | 5 / 6 / 6.35 / 8 / 10 / 12 / 12.7 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 25 mm |
| Hub Type | BF-type (flanged hub with set screw) |
| Material | Aluminum alloy |
| Pitch Diameter Range | Approx. 39.5mm (62T) – 76.4mm (120T) |
| Flange | Double flange (belt retention flanges on both sides) |
| Weight | See variant options |
| Surface Finish | See variant options |
The tooth count determines the pulley's pitch diameter and, combined with your motor pulley, sets the drive ratio. Larger tooth counts (e.g., 100T–120T) give a larger driven pulley for speed reduction, while smaller counts (62T–68T) are used where space is limited or a 1:1 ratio is needed. Calculate pitch diameter as: Teeth × Pitch (2mm) ÷ π. For example, a 80T pulley has a pitch diameter of approximately 50.9mm.
Standard NEMA 17 stepper motors have a 5mm output shaft. Select the 5mm bore variant. If your motor has a D-cut or flat on the shaft, the set screw in the BF-type hub will engage the flat for a more secure connection. For other motor types, measure your shaft diameter with calipers before ordering.
BF-type pulleys feature a flanged hub — the hub extends beyond the pulley body and includes a set screw for shaft clamping. B-type pulleys have a plain bore without a protruding hub. BF-type is preferred when you need positive axial positioning and easy removal from the shaft, making it common in 3D printers and CNC machines where maintenance access matters.
Yes. This pulley is designed for GT2 2mm-pitch belts in 6mm width, which is the standard used in most desktop 3D printers (Ender, Voron, CoreXY platforms), laser engravers, and compact CNC routers. It is compatible with both open-ended GT2 belt stock and closed-loop GT2 belt loops of the appropriate width.
The set screw provides sufficient clamping force for typical 3D printer and light CNC loads. For high-torque or high-speed applications, ensure the set screw is tightened against a flat on the shaft (D-shaft) rather than a round shaft, as this significantly increases holding force. Use a thread-locking compound (e.g., medium-strength Loctite) if vibration is a concern.
This pulley is suitable for driven (motor-side) pulley positions in CoreXY and similar belt-driven 3D printer architectures. Verify the tooth count and bore match your motor shaft and belt routing design. For idler positions, you would typically use a smooth idler pulley rather than a toothed pulley like this one.
Pitch diameter = Teeth × 2mm ÷ π. Approximate values: 62T ≈ 39.5mm, 70T ≈ 44.6mm, 80T ≈ 50.9mm, 90T ≈ 57.3mm, 100T ≈ 63.7mm, 110T ≈ 70.0mm, 120T ≈ 76.4mm. Use these values to calculate belt length and center distance for your drive system.
